diff options
Diffstat (limited to 'drivers/acpi/acpica/utownerid.c')
| -rw-r--r-- | drivers/acpi/acpica/utownerid.c | 12 |
1 files changed, 9 insertions, 3 deletions
diff --git a/drivers/acpi/acpica/utownerid.c b/drivers/acpi/acpica/utownerid.c index c82399f9b456..1b3ee74a87eb 100644 --- a/drivers/acpi/acpica/utownerid.c +++ b/drivers/acpi/acpica/utownerid.c @@ -104,13 +104,19 @@ acpi_status acpi_ut_allocate_owner_id(acpi_owner_id *owner_id) break; } - if (!(acpi_gbl_owner_id_mask[j] & (1 << k))) { + /* + * Note: the u32 cast ensures that 1 is stored as a unsigned + * integer. Omitting the cast may result in 1 being stored as an + * int. Some compilers or runtime error detection may flag this as + * an error. + */ + if (!(acpi_gbl_owner_id_mask[j] & ((u32)1 << k))) { /* * Found a free ID. The actual ID is the bit index plus one, * making zero an invalid Owner ID. Save this as the last ID * allocated and update the global ID mask. */ - acpi_gbl_owner_id_mask[j] |= (1 << k); + acpi_gbl_owner_id_mask[j] |= ((u32)1 << k); acpi_gbl_last_owner_id_index = (u8)j; acpi_gbl_next_owner_id_offset = (u8)(k + 1); @@ -201,7 +207,7 @@ void acpi_ut_release_owner_id(acpi_owner_id *owner_id_ptr) /* Decode ID to index/offset pair */ index = ACPI_DIV_32(owner_id); - bit = 1 << ACPI_MOD_32(owner_id); + bit = (u32)1 << ACPI_MOD_32(owner_id); /* Free the owner ID only if it is valid */ |